We demonstrate that a moirésuperlattice nanocavity constructed in a photonic crystal slab promises strongly enhanced nonlinear optics,which is beneficial from the high-quality factor and high coupling efficiency ...We demonstrate that a moirésuperlattice nanocavity constructed in a photonic crystal slab promises strongly enhanced nonlinear optics,which is beneficial from the high-quality factor and high coupling efficiency of the flat-band mode with zero group velocity.From a silicon moirésuperlattice nanocavity integrated with few-layer gallium selenide(GaSe),the second-harmonic generation(SHG)of GaSe is enhanced by over 10,000 times,and the third-harmonic generation(THG)is enhanced by 8500 times.Our results suggest the moirésuperlattice nanocavity could be considered as a promising platform for developing high-efficiency nonlinear photonic devices.展开更多
基金National Key Research and Development Program of China(2022YFA1404800)National Natural Science Foundation of China(12374359,62375225,62305270,62205273,62104198)+2 种基金Xi'an Science and Technology Plan Project(2023JH-ZCGJ-0023)Shaanxi Fundamental Science Research Project for Mathematics and Physics(22JSY004,22JSQ039)Key R&D Program of Shaanxi Province(2023-JC-YB-502)。
文摘We demonstrate that a moirésuperlattice nanocavity constructed in a photonic crystal slab promises strongly enhanced nonlinear optics,which is beneficial from the high-quality factor and high coupling efficiency of the flat-band mode with zero group velocity.From a silicon moirésuperlattice nanocavity integrated with few-layer gallium selenide(GaSe),the second-harmonic generation(SHG)of GaSe is enhanced by over 10,000 times,and the third-harmonic generation(THG)is enhanced by 8500 times.Our results suggest the moirésuperlattice nanocavity could be considered as a promising platform for developing high-efficiency nonlinear photonic devices.
